tor-browser

The Tor Browser
git clone https://git.dasho.dev/tor-browser.git
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trap-is-undefined-target-is-proxy.js (960B)

      1 // |reftest| module
      2 // Copyright (C) 2020 Alexey Shvayka. All rights reserved.
      3 // This code is governed by the BSD license found in the LICENSE file.
      4 
      5 /*---
      6 esid: sec-proxy-object-internal-methods-and-internal-slots-preventextensions
      7 description: >
      8  If "preventExtensions" trap is null or undefined, [[PreventExtensions]] call
      9  is properly forwarded to [[ProxyTarget]] (which is also a Proxy object).
     10 info: |
     11  [[PreventExtensions]] ( )
     12 
     13  [...]
     14  4. Let target be O.[[ProxyTarget]].
     15  5. Let trap be ? GetMethod(handler, "preventExtensions").
     16  6. If trap is undefined, then
     17    a. Return ? target.[[PreventExtensions]]().
     18 
     19  [[PreventExtensions]] ( )
     20 
     21  1. Return true.
     22 features: [Proxy, Reflect]
     23 flags: [module]
     24 ---*/
     25 
     26 import * as ns from "./trap-is-undefined-target-is-proxy.js";
     27 
     28 var nsTarget = new Proxy(ns, {});
     29 var nsProxy = new Proxy(nsTarget, {
     30  preventExtensions: undefined,
     31 });
     32 
     33 assert(Reflect.preventExtensions(nsProxy));
     34 
     35 reportCompare(0, 0);